Bartter syndrome

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Bartter syndrome
Other namesSalt-wasting nephropathy[1]
Scheme of renal tubule and its vascular supply.
SpecialtyEndocrinology Edit this on Wikidata

Bartter syndrome (BS) is a rare inherited disease characterised by a defect in the

thick ascending limb of the loop of Henle, which results in low potassium levels (hypokalemia),[2] increased blood pH (alkalosis), and normal to low blood pressure. There are two types of Bartter syndrome: neonatal and classic. A closely associated disorder, Gitelman syndrome, is milder than both subtypes of Bartter syndrome.[citation needed
]

Signs and symptoms

In 90% of cases, neonatal Bartter syndrome is seen between 24 and 30 weeks of gestation with excess

kidney stones. In rare occasions, the infant may progress to kidney failure.[3]

Patients with classic Bartter syndrome may have symptoms in the first two years of life, but they are usually diagnosed at school age or later. Like infants with the neonatal subtype, patients with classic Bartter syndrome also have polyuria, polydipsia, and a tendency to dehydration, but normal or just slightly increased urinary calcium excretion without the tendency to develop kidney stones. These patients also have vomiting and growth retardation. Kidney function is also normal if the disease is treated,[4] but occasionally patients proceed to end-stage kidney failure. Bartter syndrome consists of

prostaglandins by the kidneys is often found. Magnesium wasting may also occur. Homozygous patients experience severe hypercalciuria and nephrocalcinosis.[5]

Pathophysiology

Bartter syndrome is caused by mutations of genes encoding proteins that transport ions across renal cells in the

Na+/K+-ATPases, and chloride ions pass by facilitated diffusion through basolateral chloride channels. Potassium, however, is able to diffuse back into the tubule lumen through apical potassium channels, returning a net positive charge to the lumen and establishing a positive voltage between the lumen and interstitial space. This charge gradient is obligatory for the paracellular reabsorption of both calcium and magnesium ions.[citation needed
]

Proper function of all of these transporters is necessary for normal ion reabsorption along the thick ascending limb, and loss of any component can result in functional inactivation of the system as a whole and lead to the presentation of Bartter syndrome. Loss of function of this reabsorption system results in decreased sodium, potassium, and chloride reabsorption in the thick ascending limb, as well as abolishment of the lumen-positive voltage, resulting in decreased calcium and magnesium reabsorption. Loss of reabsorption of sodium here also has the undesired effect of abolishing the hypertonicity of the renal medulla, severely impairing the ability to reabsorb water later in the distal nephron and collecting duct system, leading to significant diuresis and the potential for volume depletion. Finally, increased sodium load to the distal nephron elicits compensatory reabsorption mechanisms, albeit at the expense of potassium by excretion by principal cells and resulting hypokalemia. This increased potassium excretion is partially compensated by α-intercalated cells at the expense of hydrogen ions, leading to metabolic alkalosis.[citation needed]

Bartter and Gitelman syndromes can be divided into different subtypes based on the genes involved:[6]

Name Bartter type Associated gene mutations Defect
neonatal Bartter's syndrome type 1
SLC12A1
(NKCC2)
Na-K-2Cl symporter
neonatal Bartter's syndrome type 2
KCNJ1
 thick ascending limb K+ channel
classic Bartter's syndrome type 3 CLCNKB Cl− channel
Bartter's syndrome with
sensorineural deafness
 type 4 BSND[7] Cl− channel accessory subunit
Bartter's syndrome associated with autosomal dominant hypocalcemia type 5 CASR[8] activating mutation of the calcium-sensing receptor
Gitelman's syndrome -
SLC12A3
(NCCT)		 Sodium-chloride symporter

Diagnosis

People with Bartter syndrome present symptoms that are identical to those of patients who are on

loop diuretics like furosemide, given that the loop diuretics target the exact transport protein that is defective in the syndrome (at least for type 1 Bartter syndrome). The other subtypes of the syndrome involve mutations in other transporters that result in functional loss of the target transporter. Patients often admit to a personal preference for salty foods.[9]

The clinical findings characteristic of Bartter syndrome is hypokalemia, metabolic alkalosis, and normal to low blood pressure. These findings may also be caused by other conditions, which may cause confusion. When diagnosing a Bartter's syndrome, the following conditions must be ruled out as possible causes of the symptomatology:[citation needed]

Patients with Bartter syndrome may also have elevated renin and aldosterone levels.[10]

Prenatal Bartter syndrome can be associated with polyhydramnios.[11]

Related conditions

  • Bartter and Gitelman syndromes are both characterized by low levels of potassium and magnesium in the blood, normal to low blood pressure, and hypochloremic metabolic alkalosis.[12]

However, Bartter syndrome is also characterized by high renin, high aldosterone, hypercalciuria, and an abnormal Na+-K+-2Cl− transporter in the thick ascending limb of the loop of Henle, whereas Gitelman syndrome causes hypocalciuria and is due to an abnormal thiazide-sensitive transporter in the distal segment.[13]

Pseudo-Bartter's syndrome is a syndrome of similar presentation as Bartter syndrome but without any of its characteristic genetic defects. Pseudo-Bartter's syndrome has been seen in cystic fibrosis,[14] as well as in excessive use of laxatives.[15]

Treatment

Medically supervised sodium, chloride and potassium supplementation is necessary, and spironolactone can be also used to reduce potassium loss.[2] Free and unqualified access to water is necessary to prevent dehydration, as patients maintain an appropriate thirst response. In severe cases where supplementation alone cannot maintain biochemical homeostasis, nonsteroidal anti-inflammatory drugs (NSAIDs) can be used to reduce glomerular filtration and can be very useful, although may cause gastric irritation and should be administered alongside stomach acid suppression therapies. Angiotensin-converting enzyme (ACE) inhibitors can also be used to reduce glomerular filtration rate. In young babies and children, a low threshold to check serum electrolytes during periods of illness compromising fluid intake is necessary.[16]

Surveillance renal ultrasound should be employed to monitor for the development of nephrocalcinosis, a common complication which further augments urinary concentrating difficulty.[17]

Prognosis

The limited prognostic information available suggests that early diagnosis and appropriate treatment of infants and young children with classic Bartter Syndrome may improve growth and perhaps intellectual development. On the other hand, sustained hypokalemia and hyperreninemia can cause progressive

end-stage kidney disease (kidney failure). With early treatment of the electrolyte imbalances, the prognosis for patients with classic Bartter Syndrome is good.[citation needed
]

History

The condition is named after Dr. Frederic Bartter, who, along with Dr. Pacita Pronove, first described it in 1960 and in more patients in 1962.[10][18][19][20]

References

  1. ^ "Bartter syndrome: MedlinePlus Medical Encyclopedia". medlineplus.gov. Retrieved 29 September 2019.
  2. ^ a b "Bartter Syndrome: Tubular and Cystic Kidney Disorders: Merck Manual Home Edition". Archived from the original on 4 January 2008. Retrieved 2007-12-31.
  3. ^ "Bartter syndrome". Medline Plus. Retrieved 3 July 2021.
  4. ^
    S2CID 41782906
    .
  5. PMID 25186299
    .
  6. S2CID 9649621
    .
  7. S2CID 34031819
    .
  8. PMID 17048213
    .
  9. ^ "Bartter syndrome". The National Center For Advancing Translational Sciences. Retrieved 23 July 2021.
  10. ^
    PMID 9513916
    .
  11. S2CID 45890736
    .
  12. PMID 5929460
    .
  13. ^ "Gitelman Syndrome". The Lecturio Medical Concept Library. Retrieved 23 July 2021.
  14. ^ Royal Brompton & Harefield Hospital Pseudo-Bartter's syndrome Archived 2011-07-21 at the Wayback Machine Retrieved Mars, 2011
  15. PMID 20661067
    .
  16. ^ "Bartter Syndrome". The Lecturio Medical Concept Library. Retrieved 3 July 2021.
  17. ^ "Bartter Syndrome". The Lecturio Medical Concept Library. Retrieved 23 July 2021.
  18. S2CID 26270693
    .
  19. Who Named It?
  20. ^ "Bartter's syndrome". www.whonamedit.com.

External links

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